Testing wastegates

jin · 07-29-2015, 08:56 PM

I am having boost issues and have replaced vacuum lines. Now using a gauge to test solenoids and wastgates. At idle I have 15" Hg from the line actuator but dont have a way of closing the wastegates at idle. You can do this with JB4 which I dont have. Any suggestions on how to do this? Just drive with gauge in my hand with window open?

MilehighM3 · 07-30-2015, 01:42 AM

Use a vacuum pump to apply the vacuum.

Odan.be · 07-30-2015, 02:00 AM

If you want to close the waste gates at idle completely, bypass the solenoids, and apply the vacuum from the canisters straight onto the tubes coming from the WG actuators.
The vacuumpump should be pulling something like 27 in hg.

grtz

jin · 07-30-2015, 02:01 AM

I used my Mityvac and vacuumed to 20" Hg. I cant hear the wastegates opening/closing. I think its holding pressure but cant be sure as there is a slow leak in the mityvac. Over 4 mins it leaked down to 15" Hg which im pretty sure is through the mityvac.

jin · 07-30-2015, 02:10 AM

Quote:

Originally Posted by Odan.be

If you want to close the waste gates at idle completely, bypass the solenoids, and apply the vacuum from the canisters straight onto the tubes coming from the WG actuators.
The vacuumpump should be pulling something like 27 in hg.

grtz

Ok will try that. The vacuum line coming from the vac cans go to the boost solenoids so assume you mean after the solenoids for front and rear?

Odan.be · 07-30-2015, 02:19 AM

Unplug the "out" ports labeled on the solenoids (these are going to the Wg actuators) and put the tubes froming the canisters to the T connectors you just unplugged

As you apply vacuum, you should see the rear WG close.

jin · 07-30-2015, 02:27 AM

I have a RHD and can't see the waste gates or actuators steering column is in the way

jin · 08-03-2015, 02:28 AM

Solved. Turns out the diverter valves were sticking. I soaked them in isopropyl alcohol and working fine now. Boost is now back on the table

Odan.be · 08-03-2015, 04:22 AM

They may be working again, but i think isopropyl alcohol will dry out your rubber diagrams in the oem diverter valves. So they will start leaking again...

jin · 08-03-2015, 05:12 AM

I didn't think about that but you're probably right. Maybe blowby will lubricate it before it clogs up again.

07-29-2015, 08:56 PM	#1
jin Second Lieutenant 79 Rep 252 Posts Drives: 2007 E90 335i Join Date: Jan 2015 Location: NZ iTrader: (2)	Testing wastegates I am having boost issues and have replaced vacuum lines. Now using a gauge to test solenoids and wastgates. At idle I have 15" Hg from the line actuator but dont have a way of closing the wastegates at idle. You can do this with JB4 which I dont have. Any suggestions on how to do this? Just drive with gauge in my hand with window open?
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07-30-2015, 01:42 AM	#2
MilehighM3 Brigadier General 926 Rep 3,461 Posts Drives: Harrop E90 M3 Join Date: May 2011 Location: Colorado Springs iTrader: (14) Garage List 2009 E90 M3 [6.50]	Use a vacuum pump to apply the vacuum.
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07-30-2015, 02:00 AM	#3
Odan.be Private First Class 26 Rep 84 Posts Drives: Bmw E91 3351 Join Date: Mar 2014 Location: Belgium iTrader: (0)	If you want to close the waste gates at idle completely, bypass the solenoids, and apply the vacuum from the canisters straight onto the tubes coming from the WG actuators. The vacuumpump should be pulling something like 27 in hg. grtz
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07-30-2015, 02:01 AM	#4
jin Second Lieutenant 79 Rep 252 Posts Drives: 2007 E90 335i Join Date: Jan 2015 Location: NZ iTrader: (2)	I used my Mityvac and vacuumed to 20" Hg. I cant hear the wastegates opening/closing. I think its holding pressure but cant be sure as there is a slow leak in the mityvac. Over 4 mins it leaked down to 15" Hg which im pretty sure is through the mityvac.
	Appreciate 0 Quote

07-30-2015, 02:19 AM	#6
Odan.be Private First Class 26 Rep 84 Posts Drives: Bmw E91 3351 Join Date: Mar 2014 Location: Belgium iTrader: (0)	Unplug the "out" ports labeled on the solenoids (these are going to the Wg actuators) and put the tubes froming the canisters to the T connectors you just unplugged As you apply vacuum, you should see the rear WG close.
	Appreciate 0 Quote

07-30-2015, 02:27 AM	#7
jin Second Lieutenant 79 Rep 252 Posts Drives: 2007 E90 335i Join Date: Jan 2015 Location: NZ iTrader: (2)	I have a RHD and can't see the waste gates or actuators steering column is in the way
	Appreciate 0 Quote

08-03-2015, 02:28 AM	#8
jin Second Lieutenant 79 Rep 252 Posts Drives: 2007 E90 335i Join Date: Jan 2015 Location: NZ iTrader: (2)	Solved. Turns out the diverter valves were sticking. I soaked them in isopropyl alcohol and working fine now. Boost is now back on the table
	Appreciate 0 Quote

08-03-2015, 04:22 AM	#9
Odan.be Private First Class 26 Rep 84 Posts Drives: Bmw E91 3351 Join Date: Mar 2014 Location: Belgium iTrader: (0)	They may be working again, but i think isopropyl alcohol will dry out your rubber diagrams in the oem diverter valves. So they will start leaking again...
	Appreciate 0 Quote

08-03-2015, 05:12 AM	#10
jin Second Lieutenant 79 Rep 252 Posts Drives: 2007 E90 335i Join Date: Jan 2015 Location: NZ iTrader: (2)	I didn't think about that but you're probably right. Maybe blowby will lubricate it before it clogs up again.
	Appreciate 0 Quote

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